[doc] #326: Update coverage badge in the readme

5 jobs for !189 with 326_gitlab_coverage in 1 minute and 46 seconds (queued for 10 seconds)
latest detached
Status Name Job ID Coverage
  Checks
passed build #55504

00:00:16

 
  Tests
passed tests:3.6 #55505
mille

00:01:26

passed tests:3.7 #55506
mille

00:01:22

passed tests:3.8 #55507
redshift

00:01:18

passed tests:3.9:coverage #55508
redshift

00:01:28

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